3) The weights (in kg) of 35 persons are given below: 43, 51, 47, 62, 48, 40, 50, 62, 53, 56, 40, 48, 56, 53, 50, 42, 55, 52, 48, 46, 45, 54, 52, 50, 47, 44, 54, 55, 60, 63,
58, 55, 60, 58, 53

a) Group this data by using the Sturges’ formula to determine the number of classes. Keep the width of
each class equal.
b) Find the mean, median, standard deviation and variance of the grouped data obtained in (a) above.